S-Tier: Kyo, K', King, Kula, Andy, Yuri
A+: Takuma, Iori, Shen, Hwa Jai, Kensou
A: Elizabeth, Billy, Leona, Benimaru, Ash, Mature, Daimon
B+: Kim, Mai, Robert, Clark, Chin, Duo Lon, Saiki, Vice
B: Athena, Raiden, Ralf, Ryo
C: Terry, Joe, Maxima
Unrated: DLC characters
This is just my (very inexperienced) opinion. There's a lot of characters where I'm not really sure at all about at this point: Billy (his damage potential looks good but very situational) and Vice (seems very gimmicky but can dominate once she gets her game going).